"This guy?". Cap Hardy is well-known in gunleather and was a renowned trick shooter with rifles; and a Peters ammunition salesman promoting the ammo for his performances. The gunleather surely was a sideline for him until he moved to Beverly Hills then retired :-). Born 1876 died 1950, yours is his earliest mark while in Nebraska until 1910; he is in Denver where Heiser was based by 1912 and his mark became quite unlike his first and more like Heiser's:
2 mrks (8).jpg
By 1930 he had shifted to California and his mark was:
2 mrks (9).JPG
He retired by 1941, his work featuring in McGivern's Book of 1938. Today he is best known for the Hardy-Cooper shoulder holster once made by Sparks; which is a Heiser shoulder holster design but with Hardy's mark on it (!) and a slot added to it to earn the Cooper appellation. Jeff appears to have connected with Hardy in the years after WWII. With a few notable exceptions, Hardy's holsters were Heiser clones, yours included.
A pair of his earliest newspaper appearances:
New World's Rifle Record, Capt. Hardy Hits 992 Marble Targets out of 1,000". New York Times, 14 Nov 1907. A.H. Hardy An Unequalled Record, 13066 Shots without a Miss". Sporting Life 07 Dec 1907. A.H. Hardy
And a later one:
Clark Gable Tries Leather Art Work". The Los Angeles Times, 25 Nov 1938. Capt. Hardy teaches Gable, Gary Cooper.